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Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior
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Simplified Rules for Serviceability Control of FRPRC Elements.

Tomislav Kišiček1, Tvrtko Renić1, Ivan Hafner1

  • 1Faculty of Civil Engineering, University of Zagreb, 10000 Zagreb, Croatia.

Polymers
|June 24, 2022
PubMed
Summary
This summary is machine-generated.

This study presents new methods for calculating crack width and deflection in Fiber Reinforced Polymer (FRP) reinforced concrete elements. New tables and diagrams are proposed for controlling crack width and ensuring acceptable deflection limits in FRP-reinforced concrete (FRPRC).

Keywords:
FRP reinforcementdesign chartsserviceability limit states

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Structural Engineering

Background:

  • Serviceability limit states are crucial for reinforced concrete design but complex to calculate.
  • Fiber Reinforced Polymer (FRP) bars are increasingly used as a sustainable alternative to steel in aggressive environments.
  • Existing design procedures for FRP-reinforced concrete elements (FRPRC) are adapted from steel-reinforced concrete methods, necessitating specific adjustments.

Purpose of the Study:

  • To develop and present simplified calculation procedures for controlling crack width in FRPRC elements.
  • To establish slenderness limits for FRPRC elements to meet standard deflection criteria.
  • To provide practical tools, such as new tables and diagrams, for the rapid assessment of serviceability in FRPRC.

Main Methods:

  • Parametric investigation of maximum bar diameter and spacing for crack width control in FRPRC.
  • Development of procedures and parametric calculations for determining slenderness limits in FRPRC to manage deflection.
  • Creation of new tables and diagrams based on FRP's distinct elastic modulus and various concrete classes.

Main Results:

  • Proposed tables and diagrams offer conservative estimates for maximum allowable bar diameters to control crack width in FRPRC.
  • Parametric calculations yield a diagram for slenderness limits across different concrete classes, ensuring deflections below allowable limits.
  • The derived tools are specifically tailored for FRP reinforcement, addressing the limitations of steel-based design tables.

Conclusions:

  • The developed tables and diagrams provide a valuable resource for engineers designing FRPRC structures.
  • The proposed methods offer a simplified and conservative approach to ensuring serviceability in FRPRC elements.
  • This research contributes to the broader adoption of FRP reinforcement by providing accessible design aids for critical serviceability aspects.